"(1) For the purposes of this Part, the holding of the office of constable shall be treated as employment- (a) by the chief officer of police as respects any act done by him in relation to a constable or that office; (b) by the police authority as respect any act done by them in relation to a constable of that office."
"police authority"- (a) in relation to a person appointed, or an appointment falling to be made, under a specified Act, has the same meaning as in thePolice Act 1996 , (b) in relation to any person or appointment, means the authority by whom the person in question is or on appointment would be paid; ..."